The collector to emitter voltage is almost equal to 0 when a sufficient voltage (VIN > 0.7 V) is applied between the base and emitter. A transistor's switching operation is based on the voltage applied at the base terminal. The switch is turned off when there is no base voltage. In other words, when a voltage is supplied to the base, a transistor conducts current across the collector-emitter. One of the most common uses for transistors in an electronic circuit is simple switches.
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